Literally translated, 'Chindōgu' means . The term was coined by Kenji Kawakami, a Japanese inventor and writer who first made the idea prominent in a book translated into English, in the mid-nineties, as 101 Unuseless Japanese Inventions: The Art of Chindōgu. The popular success of this book prompted a follow-up, 99 More Unuseless Japanese Inventions, which was published a few years later. Together, the books have sold nearly a quarter of a million copies in Japan alone, and have been translated into most of the major world languages. Examples from the books include:
There are ten key tenets to bear in mind in designing a Chindōgu. The principal among these are: (a) it has to be possible to make (i.e., it has to actually exist), in spite of its absurdity; (b) it has to remain in the public domain (i.e., it cannot be given a patent); and (c) it must not be exclusively a vehicle for humour, or the warped satirical worldview of the inventor. There is frequently humour in a Chindōgu, of course, but this should properly be regarded as incidental, rather than as an end unto itself. A full list of the tenets is available here
In spite of the stipulation that Chindōgu should not be used for satirical ends, Kawakami himself does appear to regard them as a kind of antidote to consumerism, and the Western obsession with making life as 'easy' as possible. He describes Chindōgu as "invention dropouts," anarchically brilliant ideas that have broken free from "the suffocating historical dominance of conservative utility." One might wish to design Chindōgu for a number of reasons, for example, to improve one's mental sharpness; to develop them as an art form; or simply to revel in a purely creative act without having to worry about utility or making money.
And then, of course, there is the simple pleasure to be had from a perfectly logical solution that turns out to be perfectly useless.
Chindōgu and its creator Kenji Kawakami also became a regular feature on a children's television show produced by the BBC called It'll Never Work, a show in a similar vein as the BBC's Tomorrow's World; however, It'll Never Work usually focused more on wacky and humorous gadgets than on serious scientific and technological advances.